Hi all, Trying to trouble shoot some poor performance on my new to me boat. The boat is an 82 Springbok Rocket 3 16' aluminim. On the back is an 82 60hp Evinrude twin cylinder. It currently has an 11.75x17" prop. I'm having a hard time getting on plane and also have a low top speed. I don't have a tach but it seem like the motor is bogging some. I have checked the carbs and the butterflies are opening completely. On my GPS tonight we hit a top speed of 27mph with about 450lbs of mammal in the boat and an almost empty tank of fuel. I tried a few different pin settings on the for trim. On the lowest hole it seemed to be pushing the nose down to much and we were plowing water. One notch up was pretty good until a hard turn. Then the prop would spin out and revs would increase dramatically while the boat slowed way down. Another hole higher had the prop slipping on the straights even.
The motor has a whale tail on it install on the cavitation plate. When lowered the motors site with the cavitation plate even with the bottom of the keel.
On a previous day with 4 people and more weight it didn't have a chance to get on plane. Even now its slow to plane out. I'm hoping to use it to pull a tuber and maybe a skier if possible... I don't really need to go fast and would rather get on plane and be able to pull. Currently the boat does neither.
The prop on it now is pretty dinged up and the blades seem cupped or bent up some. I'm sure this could be contributing to my issues. Tomorrow I'm off to look for a tach and a new prop. I'm thinking on dropping pitch to a 15 or 13.
Any comments or advice would be fantastic!!!
Thanks in advance,
Tyler
The motor has a whale tail on it install on the cavitation plate. When lowered the motors site with the cavitation plate even with the bottom of the keel.
On a previous day with 4 people and more weight it didn't have a chance to get on plane. Even now its slow to plane out. I'm hoping to use it to pull a tuber and maybe a skier if possible... I don't really need to go fast and would rather get on plane and be able to pull. Currently the boat does neither.
The prop on it now is pretty dinged up and the blades seem cupped or bent up some. I'm sure this could be contributing to my issues. Tomorrow I'm off to look for a tach and a new prop. I'm thinking on dropping pitch to a 15 or 13.
Any comments or advice would be fantastic!!!
Thanks in advance,
Tyler